JPH0550989B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention includes a carriage on which a printing head and a printing ribbon are placed and movable along a platen, and a correction ribbon displaceably supported by the carriage. The present invention relates to a typewriter having a collection function and a holder for holding a typewriter.

[Prior Art] Conventionally, in this type of typewriter, a ribbon holder held in a carriage is swung by a ribbon lift cam rotated by a drive motor to lift the print ribbon and correction ribbon on the ribbon holder. Some devices are designed to selectively dispose the device at a use position facing the platen. In addition, the printing ribbon is always placed in the use position facing the platen, and during correction, the drive motor rotates the ribbon lift cam and swings the ribbon holder held in the carriage, so that the correction ribbon supported by the ribbon holder is rotated by the drive motor. Some printers are arranged between the printing ribbon and the platen.

[Problems to be Solved by the Invention] However, in conventional typewriters, when the power is cut off during correction printing using the correction ribbon and the power supply to the motor is stopped, the correction ribbon remains in the use position. Therefore, when you turn on the power again and start normal printing, printing using the correction ribbon will be performed first.
I had a problem with the printer not printing.

Further, in order to solve this problem, it is possible to provide a dedicated detector for detecting the position of the correction ribbon, but this increases the number of parts and increases the manufacturing cost.

[Purpose of the Invention] This invention was made to solve the above problems, and its purpose is to eliminate the problem when the power is turned off during the correction printing operation, and then the power is turned on again and the normal printing operation is resumed. Even when attempting to print, the carriage's home position detection switch is used to detect that the correction ribbon is still in the erase position, and the correction ribbon is moved to the rest position, thereby eliminating the print at the first print. It is an object of the present invention to provide a typewriter capable of preventing the occurrence of mistakes and having a collection function at low cost.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a carriage on which a print head and a print ribbon are placed and movable along a platen, and a support for the carriage so as to be displaceable. and a holder for holding a correction ribbon, in which the correction ribbon is displaced between an erase position facing the platen and a rest position located below the erase position. ribbon displacing means having a cam member for displacing the holder and a motor for rotating the cam member; one switch member installed in the carriage; and for detecting the rotational position of the cam member. ,
a first actuator member disposed on the carriage that engages the cam member and activates the switch member; and a first actuator member fixed at a position corresponding to the home position of the carriage when the carriage is located at the home position. a second actuator member for activating the switch member; a determining means for determining whether the switch member is in the operative state; and a determining means that determines whether the switch member is in the operative state when the power is turned on. If it is determined that
a first movement control means for moving the carriage in a direction away from the origin position by a predetermined amount; and after the carriage is moved by the first movement control means, if the judgment means again determines that the switch member is in the operating state, the ribbon a displacement control means for displacing the correction ribbon to a rest position by displacing the holder by the displacement means; and a judgment means when the switch member is judged not to be in an operating state by the judgment means, or after the correction ribbon is displaced by the displacement control means. and second movement control means for moving the carriage toward the home position until the switch member is determined to be in the actuated state.

[Operation] When the typewriter is powered on, if the determining means determines that one switch member is in the operating state, the first movement control means moves the carriage in a direction away from the original position. If the determining means again determines that the switch member is in the operating state, the displacement controlling means causes the ribbon displacing means to displace the correction ribbon to the rest position. After displacement of the correction ribbon by the ribbon displacement means,
The second movement control means moves the carriage toward the home position until the determination means determines that the switch member is in the actuated state.

On the other hand, when the typewriter is powered on or after the carriage is moved by the first movement control means, if the judgment means judges that the switch member is not in the operating state, the second movement control means The carriage is moved toward the home position until it is determined that the switch member is in the activated state.

[Example] Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

A platen 2 is rotatably supported on a frame 1 of the typewriter, and a guide shaft 3 and a guide rail 4 extending parallel to the platen 2 are installed. A carriage 5 is supported on the guide shaft 3 and the guide rail 4 so as to be movable along the platen 2, and is driven by a carriage drive motor 37 (see FIG. 1) consisting of a step motor.

A ribbon holder 6 is swingably supported on the upper part of the carriage 5 by a support shaft 7. A ribbon cassette 8 containing a printing ribbon 8a is mounted on the ribbon holder 6, and a portion of the printing ribbon 8a is exposed so as to be able to run along the platen 2. On both sides of the ribbon holder 6, a supply spool 10 wound with an unused correction ribbon 9 and a take-up spool (not shown) for winding up the used correction ribbon 9 are rotatably supported. The running portion of the correction ribbon 9 in is the printing ribbon 8a.
is located below the exposed part of the

As shown in FIGS. 2 and 3, a ribbon lift cam 12 is rotatably supported on a shaft 11 installed on the carriage 5, and one side of the ribbon lift cam 12 has a small diameter portion 13a and a large diameter portion. A grooved cam 13 with a groove 13b is formed. On the other hand, the ribbon holder 6 has a follower pin 6 that engages with the groove cam 13.
a is provided in a protruding manner, and when the follower pin 6a is engaged with the small diameter portion 13a as shown in FIG. . Further, as shown in FIG. 4, when the follower pin 6a is engaged with the large diameter portion 13b, the correction ribbon 9a is placed at the second lift position facing the platen 2.

A petal type type wheel 14 having a large number of type elements 14a on its outer periphery is disposed on the carriage 5 close to the platen 2, and is connected at its center to a motor shaft 15a of a type selection motor 15 (see FIG. 1). has been done. As the type selection motor 15 rotates, one type element 14a is selectively placed at a printing position facing the platen 2. The type element 1
4a is struck by a printing hammer (not shown), characters are printed on the printing paper on the platen 2 by the printing ribbon 8a, and the correction ribbon 9
erroneously printed characters may be erased.

A driven gear 18 is rotatably supported on the shaft 11, and is rotated via a gear transmission mechanism 17 by a DC motor 16 for performing a ribbon lifting operation and a type striking operation by a printing hammer. Further, a clutch collar 19 constituting a clutch mechanism for transmitting or blocking the rotation of the driven gear 18 to the ribbon rephoto cam 12 is mounted on the shaft 11. A pair of locking protrusions 19a and 19b are provided on the outer periphery of the clutch collar 19 and protrude at equal angular intervals. When the rotation of the clutch collar 19 is restrained via each of the locking protrusions 19a and 19b, the drive transmission between the driven gear 18 and the ribbon lift cam 12 is interrupted by the action of a clutch spring (not shown) within the clutch collar 19. be done. Further, when the rotation of the clutch collar 19 is not restrained, the rotation of the driven gear 18 is transmitted to the ribbon lift cam 12 by the action of the clutch spring.
is rotated clockwise in FIG.

A collection trigger solenoid 20 is mounted on the carriage 5 below the left side of the ribbon lift cam 12. Also, that solenoid 2
An armature 21 is rotatably supported in the vicinity of 0, and is biased to rotate clockwise in FIG. 2 by a spring 22. By energizing the solenoid 20, the armature 21 resists the biasing force of the spring 22.
When the armature 21 is attracted, the bent end of the armature 21 moves outward according to the rotation locus of the locking protrusions 19a and 19b, and when the solenoid 20 is de-energized, the spring 22 is turned on. The force causes the armature 21 to move into the rotation locus of the locking projections 19a, 19b so that it can engage with each of the locking projections 19a, 19b. The ribbon displacement means of the present invention is composed of the ribbon lift cam 12, the follower pin 6a, the DC motor 16, the solenoid 20, the armature 21, and the like.

A half-moon-shaped operating cam piece 23 is integrally formed on the outer periphery of the ribbon lift cam 12, and
At the lower right side of the ribbon lift cam 12, the carriage 5 is equipped with a leaf switch (hereinafter referred to as a switch) 24 having a pair of contacts 24a. Between the ribbon lift cam 12 and the switch 24, an approximately L-shaped actuating piece 25 is rotatably supported by a shaft 26 at its intermediate portion, and one arm 25a is attached to the outer circumference of the actuating cam piece 23. is biased to rotate in the direction of engagement. Based on the engagement with the actuating cam piece 23, the actuating piece 25 is reciprocated between the inoperative position shown in FIG. 2 and the actuating position shown in FIG. Both contacts 2 of the switch 24 are connected by the arm 25b on the other side of the switch 24.
4a is opened and closed, and the switch 24 is turned on and off. The switch 24 constitutes a switch member of the present invention, and the operating piece 25 constitutes a first actuator member of the present invention.

On the other hand, as shown in FIG.
Inclined surface 27a on which the other arm 25a of No. 5 can engage and disengage.
An engaging body 27 is provided to protrude inwardly. When the carriage 5 is moved to the left end of the movement range, the other arm 25b of the actuating piece 25 engages with the inclined surface 27a of the engaging body 27, so that the actuating piece 25 moves along the inclined surface 27a. Second
The switch 24 is rotated from the non-operating position shown in the figure to the operating position shown in FIG. 4, and the switch 24 is accordingly turned on. Note that the engaging body 27 constitutes a second actuator member of the present invention.

Next, the electrical configuration of the typewriter in this embodiment will be explained with reference to FIG. At 30, the fifth
ROM (read only memory) that stores various control programs as shown in the flowchart in the figure.
31 and RAM (random access memory) 32
is connected. As various keys on the keyboard 33 are operated, various control signals are input to the CPU 30, and based on these various control signals, the CPU 30 controls each motor driver 34, 35,
36 and a solenoid driver 38 to control the operation of the carriage drive motor 37, the CD motor 16, the type selection motor 15, and the solenoid 20. Further, a predetermined detection signal is inputted to the CPU 30 from the switch 24 .

Next, the operation of the typewriter in this embodiment will be explained according to the flowchart of FIG.

First, when the typewriter is powered on, a ribbon lift position detection operation (a ribbon lift cam position detection operation) is first performed. That is, CPU3
0, the on/off state of the switch 24 is determined in step S1 (hereinafter simply referred to as S1; the same applies to other steps). If the determination result is YES, that is, in the ON state, in the next S2, the carriage drive motor 37 is driven to move the carriage 5 to the 40
Move it one step to the right. As a result, even if the carriage 5 is located at the left end of the frame, the actuating piece 25 on the carriage 5
After disengaging from the upper engaging body 26, the on/off state of the switch 24 is controlled by the operating cam piece 23 and the operating piece 2.
It will be determined only by the state of engagement with 5.

Subsequently, in S3, the CPU 30 again determines the on/off state of the switch 24. If it is on,
As shown in FIG. 4, the operating piece 25 is connected to the operating cam piece 23.
The switch 24 is turned on by the engagement with the ribbon holder 6, and the ribbon holder 6 is placed in the second lift position. For this reason,
After the CPU 30 drives the DC motor 16 in S4,
At S5, a trigger pulse is output to the collection trigger solenoid 20 for a predetermined period of time. then
Proceeding to S6, the drive of the DC motor 16 is stopped.

That is, when the solenoid 20 is energized, the armature 21 is attracted as shown in FIG. 4, and its tip is separated from one of the locking protrusions 19a of the clutch collar 19. Then, the driven gear 18 is moved by the clutch mechanism including the clutch collar 19.
The rotation is transmitted to the ribbon lift cam 12, and the cam 12 begins to rotate clockwise in FIG. Then, before the other locking protrusion 19b of the clutch collar 19 faces the tip of the armature 21, the energization to the solenoid 20 is stopped, and the tip of the armature 21 is moved into the rotational trajectory of the other locking protrusion 19b. . Continuing clutch color 19
As the clutch collar 19 rotates, the other locking protrusion 19b engages with the armature 21 as shown in FIG. 2, and the rotation of the clutch collar 19 is restrained, and the ribbon lift cam 12 is stopped after making a half rotation.

As the ribbon lift cam 12 rotates, the ribbon holder 6 is lowered from the second lift position shown in FIG. 4 to the first lift position shown in FIG. 2 through the engagement of the grooved cam 13 and the follower pin 6a. , a printing ribbon 8a is arranged facing the platen 2.

Next, the CPU 30 determines the on/off state of the switch 24 again in S7, and if it is in the off state,
In S8, predetermined error processing such as buzzer operation is performed. On the other hand, if the determination result in S7 and the above-mentioned S1 and S3 is NO, that is, when the switch 24 is in the OFF state, the ribbon lift position detection operation is completed and the next step S9 is performed in order to perform the carriage origin position detection operation.
Proceed to.

In S9, the CPU 30 starts driving the carriage drive motor 37. In S10 to S12, it is determined whether the switch 24 is turned on every time the carriage drive motor 37 is driven by four steps. That is, as shown in FIG. 2, with the ribbon holder 6 placed in the first lift position and the switch 24 turned off, the carriage 5 is moved to the left by four steps by the carriage drive motor 37. When the other arm portion 25b of the actuating piece 25 engages with the inclined surface 27a of the engaging body 27, the actuating piece 25 is rotated clockwise in the figure.
As a result, the switch 24 is turned on in the same way as when the ribbon holder 6 is placed in the second lift position. When the CPU 30 determines that the ON signal has been input from the switch 24 eight times in a row, it stops driving the carriage drive motor 37, positions and holds the carriage 5 at the home position, and ends the carriage home position detection operation. .

Note that during this operation, after the leftward movement of the carriage 3 is restricted by the frame 1, the carriage drive motor 37 is out of step. On the other hand, when the judgment result of S12 does not become YES even if the carriage drive motor 37 is driven by 1300 steps corresponding to the entire movement range of the carriage 5, the CPU 30
In S13, predetermined error processing is performed.

On the other hand, when the judgment result of S12 becomes YES, the CPU
30 stops the drive of the carriage drive motor 37 in the next step S14. After the CPU 30 performs a predetermined type wheel origin detection operation in S15,
At S16, move the carriage 5 to the printing start position. Therefore, the operator can immediately start the normal printing operation by operating the keys on the keyboard 33, and there is no risk of using the correction ribbon 9 by mistake when starting printing. Furthermore, CPU3
0 constitutes the judgment means of the present invention by executing S1 or S3, constitutes the first movement control means of the present invention by executing S2, and constitutes the first movement control means of the present invention by executing S4 to
Executing S6 constitutes the displacement control means of the present invention, and executing S9 to S14 constitutes the second movement control means of the present invention.

As described above, before starting the printing operation, the lift position of the ribbon holder 6 is confirmed, and the printing ribbon 8a is
is always placed in a position opposite to Latin 2, so even if the power is turned off during correction printing and the power is turned on again to perform normal printing, the possibility of a printing error occurring at the beginning is prevented. can be prevented. In addition, since the switch 24 for detecting the lift position of the ribbon holder 6 can also detect the origin of the carriage 3, there is no need to provide a separate switch exclusively for detecting the origin of the carriage, reducing the number of parts and reducing costs. can be manufactured.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, a switch that is directly turned on and off by engagement with the ribbon holder 6 may be connected to the carriage 5.
When the device is attached to the device, the configuration of each part can be arbitrarily changed without departing from the spirit of the present invention.

[Effects of the Invention] As detailed above, the present invention eliminates the risk of a printing error occurring at the beginning even if the power is turned off during a correction printing operation and the power is turned on again to perform a normal printing operation. can be prevented. In addition, without providing a special switch member to detect the position of the correction ribbon, the carriage origin detection switch is used to detect that the correction ribbon remains in the erase position, and move the correction ribbon to the rest position. This has extremely great effects, such as the fact that it can be manufactured at low cost without increasing the number of parts.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the electrical configuration of a typewriter embodying the present invention, Fig. 2 is a partial side sectional view of the typewriter during correction printing operation, and Fig. 3 is a partial plane view when detecting the origin of the carriage. 4 is a partial side sectional view of the carriage during normal printing operation, and FIG. 5 is a flowchart. In the figure, 2 is a platen, 5 is a carriage,
6 is a ribbon holder, 8a is a printing ribbon, 9 is a correction ribbon, 12 is a ribbon lift cam, 16 is a DC motor, 23 is an operating cam piece, 24 is a leaf switch, 25 is an operating piece, 25a and 25b are arms, 27
is an engaging body, and 30 is a CPU.

Claims (1)

[Scope of Claims] 1. A collection function comprising a carriage on which a printing head and a printing ribbon are placed and movable along the platen, and a holder movably supported by the carriage and holding a correction ribbon. A typewriter comprising: a cam member for displacing the holder; and a cam member for displacing the correction ribbon between an erase position facing the platen and a rest position located below the erase position. a ribbon displacing means having a rotating motor; a switch member mounted on the carriage; and a switch member that engages with the cam member to detect the rotational position of the cam member and place the switch member in an actuated state. a first actuator member mounted on the carriage for activating the switch member; an actuator member; a determining means for determining whether or not the switch member is in an operating state; and when the determining means determines that the switch member is in an operating state at power-on, the carriage is a first movement control means for moving the carriage in a direction away from the origin position by a predetermined amount; and after the first movement control means moves the carriage, if the judgment means again determines that the switch member is in the operating state, the ribbon Displacement control means for displacing the correction ribbon to a rest position by displacing the holder by the displacement means, and when the switch member is determined not to be in an operating state by the determination means, or after the correction ribbon is displaced by the displacement control means. A typewriter having a collection function, comprising: second movement control means for moving the carriage toward the origin position until the judgment means determines that the switch member is in the operating state. 2 The first and second actuator members are 1
It is composed of two double-arm members, which are moved in the direction of contacting the peripheral edge of the central member, and the other arm is rotated by a protruding piece provided on the typewriter body when the carriage is at the home position. 2. A typewriter with a collection function according to claim 1, wherein either one of the arms engages with the switch member to put the switch member into an operating state.